Strengthen language about teaching
Make 'What is Data Carpentry' paragraph more active

The paragraph read more like a history lesson than one focused on what we're
doing now and what we will be doing with the new funding. It also contained
some weak language. This attempts to make it a more confident, forward looking
presentation.
Tighten last two paragraphs
Merge pull request #3 from ethanwhite/moore-announce

Moore announcement edits